Researchers have used terahertz light pulses to induce ferromagnetism in a crystal at temperatures far above its normal transition temperature, paving the way for optically controlled memory and computing devices with higher speed and efficiency. Scientists in Germany and the USA have shown for t
Magnetic spins in YTiO3 are synchronized by THz light, leading to a stronger and higher temperature ferromagnetic phase. Credit: © Jörg Harms, MPSD
Scientists in Germany and the USA have shown for the first time that terahertz light pulses can stabilize ferromagnetism in a crystal at temperatures more than three times its usual transition temperature. As the team reports in the journal, using pulses just hundreds of femtoseconds long , a ferromagnetic state was induced at high temperature in the rare-earth titanate YTiOwhich persisted for many nanoseconds after the light exposure.
Using a powerful THz light source developed at the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, the team managed to achieve ferromagnetism in YTiOup to nearly 100 K , far above its normal transition temperature. The light-induced state also persisted for many nanoseconds. The intense light pulse is designed to ‘shake’ the material’s atoms in a coordinated way, allowing the electrons to align their spins.
The THz source used in these experiments delivers intense pulses and is capable of exciting a very narrow frequency region in the material, making it an extremely precise tool. It has already been deployed in several other MPSD-led studies on light-enhanced superconductivity and magnetism. However, this work revealed for the first time that qualitatively different effects can be produced by exciting a range of lattice vibrations.
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